considering new boiler,,,only gas to upgrade to 22mm??????

[sonofrob]

hello,,,im considering getting my old caffoteaux 80 replaced with a modern condensor one,,,maybe a baxi duotec 24kw,,,is it only the gas pipe i have to upgrade??? all pipes going to the chaff are 15mm,,,would the rest need taking up to 22mm or just the gas i wonder,,,as if the house needs ripping apart it might be easier to spend some money on the chaff 80,,,cheers....................

 

[skhudy]

Central Heating flow and Return are 22mm on new combi boilers..

 

[picasso]

If your house aint enormous (with a 24kw combi I am guessing not) 15mm flow and return pipes should be fine.

 

[gigz]

And on old caffoteaux 80's At least the tails were/are. (22mm that is)

 

[sonofrob]

its just a terrace house,,,3 rads up,,,4 down,,,and downstairs bathroom...

 

[picasso]

I cant guarantee it but it should be fine on 15mm pipes.